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350-401 Practice Question: Given the following EIGRP configuration on a…
Given the following EIGRP configuration on a router:
router eigrp 200 network 192.168.1.0 0.0.0.255 network 10.0.0.0
Which statement about this configuration is true?
⚠ Common exam trap
Cisco often tests the distinction between classful and classless network statements in EIGRP, where candidates mistakenly assume that a network statement without a wildcard mask applies only to the exact subnet rather than the entire classful range.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.
The first network statement uses a wildcard mask (0.0.0.255) to enable EIGRP only on interfaces in the 192.168.1.0/24 subnet, while the second network statement (10.0.0.0) is classful and enables EIGRP on all interfaces in the 10.0.0.0/8 range. EIGRP network statements can include a wildcard mask to specify a subnet; without one, the router assumes the classful boundary.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.
Why this is correct
In classic EIGRP configuration, the network command with a wildcard mask (e.g., `network 192.168.1.0 0.0.0.255`) matches only the specific subnet 192.168.1.0/24, while a plain classful `network 10.0.0.0` matches all interfaces with any address in the 10.0.0.0/8 range. Therefore EIGRP is enabled precisely on those interfaces, and the router will begin forming adjacencies only on interfaces that match either statement.
- ✗
Both network statements are classful and will enable EIGRP on all interfaces with IP addresses in the 192.168.0.0/16 and 10.0.0.0/8 ranges.
Why it's wrong here
This option incorrectly assumes both network statements are classful. In reality, the first statement includes a wildcard mask, so it is a classless match limited to 192.168.1.0/24, not the entire 192.168.0.0/16 Class B supernet. The wildcard mask overrides the classful boundary, so EIGRP is not enabled on interfaces in other /24 subnets of 192.168.0.0/16.
- ✗
EIGRP will only be enabled on interfaces with an IP address in the 192.168.1.0/24 range.
Why it's wrong here
This option overlooks the second network statement. Even if the first statement only enables EIGRP on 192.168.1.0/24 interfaces, the classful `network 10.0.0.0` statement independently enables EIGRP on every interface with an IP address in the 10.0.0.0/8 range. As a result, EIGRP runs on interfaces in both ranges, not solely on the 192.168.1.0/24 subnet.
- ✗
This configuration will cause an error because wildcard masks are not allowed in EIGRP network statements.
Why it's wrong here
Wildcard masks are fully supported in classic EIGRP network statements; this configuration is valid and will not produce an error. In fact, the wildcard mask is used to define a prefix range for interface matching, and it is a common technique to enable EIGRP on a specific subnet rather than the entire classful network. EIGRP will simply process both statements and enable the protocol on all matching interfaces.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.